...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Generation of the North Equatorial Undercurrent Jets by Triad Baroclinic Rossby Wave Interactions
【24h】

Generation of the North Equatorial Undercurrent Jets by Triad Baroclinic Rossby Wave Interactions

机译：Triad Baroclinic Rossby波相互作用产生北赤道暗流急流

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Formation processes responsible for the North Equatorial Undercurrent (NEUC) jets that appear across the tropical North Pacific Ocean near 9°, 13°, and 18°N are explored both theoretically and using numerical models with different complexities. Analyses of an eddy-resolving global ocean general circulation model output reveal that the NEUC jets have a mode-1 baroclinic vertical structure and are spatially persistent on the interannual and longer time scales. This OGCM-simulated vertical structure prompts the authors to adopt the simpler, nonlinear 1(1/2)-layer reduced-gravity model, as well as the baroclinic Rossby wave triad interaction theory, to unravel the essential processes underlying the NEUC jets. The seed for the NEUC jets originates in annual baroclinic Rossby waves driven by the large-scale surface wind stress forcing. Emanating from the ocean basin's eastern boundary, these wind-forced "primary" waves are subject to nonlinear triad interactions and break down offshore where the e-folding time scale of the most unstable triad instability matches the advective time scale of the primary waves. The breakdown boundary of the wind-forced primary waves tends to tilt northeast-southwest and, west of this boundary, finite-amplitude eddies emerge, whose meridional scales are set by the most unstable short secondary waves participating in the triad interactions along the breakdown boundary. With their meridional scales set similarly by the short secondary waves, the time-mean zonal jets of characteristics resembling the observed NEUC jets are formed by the converging potential vorticity fluxes of these finite-amplitude eddies.
机译：理论上和使用具有不同复杂性的数值模型都对形成于北纬9°，13°和18°N的热带北太平洋的北赤道暗流（NEUC）喷射的形成过程进行了研究。对涡旋解析全球海洋总环流模型输出的分析表明，NEUC射流具有1型斜压垂直结构，并且在年际和更长的时间尺度上具有空间持久性。这种OGCM模拟的垂直结构促使作者采用更简单的非线性1（1/2）层降重力模型，以及斜压Rossby波三重轴相互作用理论，以揭示NEUC射流的基本过程。 NEUC射流的种子起源于大规模地面风应力强迫驱动下的年度斜压Rossby波。这些来自风力盆地的东部边界的风力“初级”波受到非线性三重轴相互作用的影响，并在海上分解，其中最不稳定的三重轴不稳定性的电子折叠时间尺度与初级波的对流时间尺度相匹配。风力主波的击穿边界倾向于向东南-西南倾斜，在该边界以西出现有限幅涡流，其子午线尺度是由沿着击穿边界参与三合会相互作用的最不稳定的短次级波确定的。 。这些子午线的子午尺度相似地设定，由这些有限振幅涡流的汇聚的潜在涡度通量形成了类似于所观测到的NEUC射流的时均纬向射流。

著录项

  • 来源
    《Journal of Physical Oceanography》 |2013年第12期|2682-2698|共17页
  • 作者

    Bo Qiu; Shuiming Chen; Hideharu Sasaki;

  • 作者单位

    Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road,Honolulu, HI 96822;

    Department of Oceanography, University of Hawai'i at Manoa, Honolulu, Hawaii;

    Earth Simulator Center, JAMSTEC, Yokohama, Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号